[Experimental study on CO2 absorption by aqueous ammonia-based blended absorbent].

Abstract

A crucial problem for the promising absorbent aqueous ammonia (NH3) is the low CO2 absorption rate. The mass transfer coefficient (K(G)) of CO2 in aqueous NH3-based absorbents on a wetted wall column facility was investigated. Monoethanolamine (MEA), piperazine (PZ), 1-methyl piperazine (1-MPZ) and 2-methyl piperazine (2-MPZ) were introduced into NH3 solutions as additives, all of which significantly increased the mass transfer coefficient of CO2 in the solutions. With CO2 loading of 0, 0.1, 0.3, 0.5 mol x mol(-1), K(G) of 3 mol x L(-1) NH3 + 0.3 mol x L(-1) PZ blended solution increased by 2, 2.2, 2.2, and 1.9 fold as compared to that of 3 mol x L(-1) NH3. Typically, PZ, the additive with best performance, was chosen for further study. The effects of temperature and PZ concentration on CO2 absorption in PZ solution and the blended NH3/PZ solution. The calculated pseudo first order rate constant [42.7 m3 x (mol x s)(-1)] was analyzed to further elucidate the reaction mechanism in the blended NH3/PZ solution.

Cite this paper

@article{Xia2014ExperimentalSO, title={[Experimental study on CO2 absorption by aqueous ammonia-based blended absorbent].}, author={Zhi-Xiang Xia and Qun-Yang Xiang and Xu-Ping Zhou and Meng-xiang Fang}, journal={Huan jing ke xue= Huanjing kexue}, year={2014}, volume={35 7}, pages={2508-14} }